Hi mate,
That would be fine, just make sure your distance from the light isn't too close to your plant. (Good check is to use your hand, if its too hot for your hand its too hot for the plants and raise it up until not too hot).
A good day time temperature is between 22-28 Degrees C. Humidity of around 50-70 in veg is fine also. I use HPS and I veg under 400w and if you check out any of my diaries, you'll see they are fine. Hope this helps.